Grinding fixtures



Oct- 22, 1953 c. BRYNlARsKl ETAL 3,107,462

GRINDING FIXTURES 2 Sheets-Sheet 1 Filed Jan. 24, 1962 Oct 22, 1963 c.BRYNIARSKI ETAL GRINDING FIXTURES 2 Sheets-Sheet 2 Filed Jan. 24, 1962,5 Of mm Mm e MM f TY sz w a United States Patent O 3,107,462 GRINDNGFIXTURES Chester Bryniarslri, 5254 W. Deming Piace, and ZygfrydOlelborski, 5046 W. Deming Place, hath of Chicago 39,

Filed Jan. 24, 1962, Ser. No. 168,362 8 Claims. (Cl. 51-221) Ourinvention relates to new and useful improvements in grinding xturesespecially adapted for use in holding and manually guiding workpiecesduring the grinding of radii thereon.

A principal object of our invention is to provide a fixture of thecharacter hereinafter described which is relatively simple inconstruction, one which can be economically manufactured, and which isportable.

Another object of our invention is to provide a fixture of aconstruction permitting manual manipulation relative to the grindingwheel or tool to facilitate the grinding of radii on a workpiece such,for example, a punch, the fixture being of such construction as tofacilitate making a wide range of radii on workpieces of Various sizesand shapes.

Still another object of the invention is the provision of a grindingiixture which may become a part of a kit of tools of a mechanic.

Other objects will appear hereinafter.

The invention consists in the novel combination and arrangement of partsto be hereinafter described and claimed.

The invention will be best understood by reference to the accompanyingdrawings showing the preferred form of construction, and in which:

FIG. l is a perspective view of our invention;

FIG. 2 is a sectional detail view taken substantially on line 2-2 ofFIG. l;

FIG. 3 is a plan view of the same;

FIG. 4 is a front elevational view of the same;

FIG. 5 is a perspective view of the parts shown in exploded relationwith respect to each other;

FIG. 6 is a plan view of the invention similar to FIG. 3, partly insection, showing an angle guide for the fixture.

Construction The drawings illustrate the preferred form of constructionof our invention. Such construction comprises a base plate 10 preferablyof elongated formation, the top and bottom surfaces of which aresubstantially flat. Extending longitudinally of the base plate 10 andopening from the top side thereof is a longitudinally extending groove11. Operable for movement longitudinally of the groove 11 is anelongated rib 12. The rib 12 is connected to a workholder 13 by means ofbolts 14.

Formed in the base plate 10 is an elongated slot 15, the lower portion16 of which is of a size slightly greater than the upper portion 17 soas to provide an uninterrupted shoulder 18. The shoulder 18 is engagedby a washer 19 carried by a bolt 20. The bolt 20 is threaded into anopening 21 formed in the rib 12. This arrangement provides a means ofeffecting an adjustable connection between the workholder 13 and thebase plate 10. The workholder 13 has a substantially flat bottom surface22 which is in facial abutment with the top fiat surface of the baseplate 1t). The workholder 13 is substantially rectangular in plan viewand at its forward end is provided with a substantially V-shaped seat 23against which abuts the shank 24 of a workpiece 25 to be ground.

A yoke 26 is secured to the front end 27 of the workholder 13 by meansof bolts 23, the head portions of which are confined in sockets 29formed in the yoke 26. The yoke 26 is semicircular in plan view.Projecting through the central bight portion thereof is a clamping screw31 adapted to be threaded against the shank 24 of the workpiece 25 tofirmly hold the latter in place during the grinding operation.

Inthe bottom portion of the workholder 13 there is provided a cut-outportion 32 to accommodate the head 33 of the workpiece 25 when suchworkpiece is provided with a head.

The forward portion of the base plate 10 is semicircular in plan viewdefined by a radius extending from the center of an opening 34 formed inthe base plate 10. The semicircular curved forward portion 30 of thebase plate 10 serves as a nose-piece for reasons which will be presentlyexplained.

At the option of the user, the bed plate 35 upon which the fixture isoperatively placed, may be provided with an upstanding pin or stud 36shown in dotted lines in FIG. 2, serving as a pivot about which thefixture is oscillated.

For purposes of securing the work holder 13 in an adjusted position withrespect to the base plate 10 after the operator has determined theradius to be ground and before the bolt 2t) is tightened, there areprovided in the base plate several set screws 12 which are adapted to bethreaded against the rib 12.

In FIG. 6 there is shown removably threaded into the openings 39 formedin the opposite sides of the base plate, angle guide pins 40. Such pinsare optional equipment and when used are adapted to engage the bar 37,thereby to locate the work piece 2S for the grinding of an angle on eachside thereof, or, in the case where a radius is to be ground on eachside of the radius.

While we have shown two guide pins 40 in FIG. 6, it is understood thatin a case where only one angle is to be ground, only one guide pin isrequired. The angle to be ground may be varied by adjusting the lengthor position of the guide pins 4i) relative to the base plate 10.

Operation v portion against the shank 24 of the workpiece 25 to securelyclamp the workpiece in the fixture.

The bed plate 35 is provided with a bar 37 which is normally positionedadjacent to a grinding wheel 38 diagrammatically illustrated in FIG. l.

The fixture is now placed upon the bed plate 35 and moved in a directionto dispose the nose-piece 30 against the bar 37. It will be noted thatthe nose-piece 30 when in engagement with the bar 37 will be disposedgenerally beneath the edge of the grinding wheel, thus to present theworkpiece 25 to the side of the grinding wheel for grinding operation.When this position of the workpiece with respect to the grinding wheelis thus determined, the bolt 2l) is then threaded to secure theworkholder 13 in a xed position upon the base plate 1t).

The operator now grasps the fixture by the hand and as the grindingwheel 38 is rotated, the fixture is oscillated in a horizontal planeupon the bed plate 35, thus presenting to the grinding wheel thesurfaces of the workpiece which are to be ground. This continues untilthe proper radius is formed upon the side of the workpiece 25 by thegrinding wheel 38.

Upon completion of forming the required radius on such side of theworkpiece 25, the operator unthreads the clamping bolt 31 suiciently toallow him to rotate the workpiece 25 within the seat 23 so as to presentthe opposite side of the workpiece to the grinding wheel for grindingoperation.

By adjusting the workholder 13 predetermined or calculated distances tothe rear of the long axis through the opening 34, the radius to beground on the workpiece may be varied.

By the simple oscillation of the fixture in a horizontal plane upon thebed plate 35 with the guiding nose-piece 30 of the base plate 10 bearingagainst the bar 37 and with the workpiece in engagement with thegrinding wheel 38, a radius may be ground with a minimum degree of timeand labor.

In cases where the bed plate 35 is provided with a pin 34, such pin 34may be used as the point of pivot about which the fixture is oscillatedon the bed plate 35.

The grinding fixture is of such size as will enable the user to includeit as a part of a kit of tools, if desired.

The fixture is to be formed of such material as will best serve thepurpose.

While we have illustrated and described the preferred form ofconstruction for carrying our invention into effect, this is capable ofvariation and modification without departing from the spirit of theinvention. We, therefore,

do not wish to be limited to the precise details of construction setforth, but desire to avail ourselves of such variations andmodifications as come within the scope of the appended claims.

Having thus described our invention, what we claim as new and desire toprotect by Letters Patent is:

1. A fixture for supporting a workpiece to be presented to a side of agrinding wheel comprising (a) a base member,

(b) a workholder including means for removably clamping said workpiecein position to be presented to said side of said grinding wheel,

(c) said base member having a forward end formed substantiallysemicircular in plan view and adapted to engage a stationary stoprelative to which said base member and said workholder are oscillatedwith the workpiece in engagement with the side of said wheel,

(d) and means for connecting said workholder to said base member in apredetermined position with respect thereto.

2. A fixture as defined by claim 1 wherein said workholder includes aseat into which said workpiece is adapted to be clamped.

3. A fixture as defined by claim 1 wherein said clamping means includesa yoke and a clamping bolt carried by the yoke and adapted to removablyclamp said workpiece in said workholder.

4. A fixture as defined by claim 1 in combination with a bed platehaving a pivot pin projectable in an opening 4 formed in the base memberand about which said base member and workholder are adapted to beoscillated.

5. A fixture as defined by claim 1 wherein a guide pin is carried on andextends laterally from the base plate and is adapted to engage a stopmember to locate the workpiece at an angle with respect to the grindingwheel.

6. A grinding fixture comprising (a) a base plate and a work holderarranged in vertical superimposed contacting position with respect toeach other,

(b) said base plate having a groove formed centrally in the top sidethereof in the direction of its length,

(c) a rib carried by the work holder and located Cen trally with respectthereto and extending in the direction of its length and movablypositioned in said groove to permit the work holder to be adjustedlongitudinally with respect to the base plate,

(d) means carried by the base plate and said rib for securing said baseplate and said work holder in a predetermined longitudinal position withrespect to each other,

(e) said base plate and said work holder at corresponding end portionsthereof being semicircular in plan view,

(f) and means for removably holding a workpiece in said work holderinwardly of its semicircular end portion and in a position extendingupwardly and laterally therefrom.

7. The device of claim 6 characterized by the inclusion of a relativelyat horizontally positioned support for said base plate and having a stopmember extending transversely thereof for engagement with thesemicircular end portion of the base plate to provide a pivot pointabout which said base plate and work holder are manually oscillated.

8. The device of claim 6 wherein said rib provides a seat for saidworkpiece.

References Cited in the le of this patent UNITED STATES PATENTS 870,356Hight Nov. 5, 1907 1,034,595 Dreyer Aug. 6, 1912 1,705,629 Wildbore Mar.19, 1929 2,371,831 Leming Mar. 20, 1945 2,429,893 Parks et al Oct. 8,1947 2,449,459 Eckert Sept. 14, 1948 2,718,104 Kirklin Sept. 20, 1955FOREIGN PATENTS 217,934 Australia Oct. 13, 1958

1. A FIXTURE FOR SUPPORTING A WORKPIECE TO BE PRESENTED TO A SIDE OF AGRINDING WHEEL COMPRISING (A) A BASE MEMBER, (B) A WORKHOLDER INCLUDINGMEANS FOR REMOVABLY CLAMPING SAID WORKPIECE IN POSITION TO BE PRESENTEDTO SAID SIDE OF SAID GRINDING WHEEL, (C) SAID BASE MEMBER HAVING AFORWARD END FORMED SUBSTANTIALLY SEMICIRCULAR IN PLAN VIEW AND ADAPTEDTO ENGAGE A STATIONARY STOP RELATIVE TO WHICH SAID BASE